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Ankle Joint

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Spatial postural control alterations with chronic ankle instability.

Meredith Pope¹, Lisa Chinn, David Mullineaux

¹University of Virginia, Charlottesville, VA 22904, USA.

|May 24, 2011

Summary

This summary is machine-generated.

Individuals with chronic ankle instability (CAI) exhibit altered postural control, with greater anterior displacement of center of pressure (COP) and time to boundary (TTB) minima during static balance tasks. This may be due to adopting a more dorsiflexed ankle position for stability.

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Area of Science:

Biomechanics
Motor Control
Sports Medicine

Background:

Chronic ankle instability (CAI) is associated with postural control deficits.
Previous research identified static balance impairments using center of pressure (COP) and time to boundary (TTB) measures.
The spatial distribution of COP and TTB minima under the foot in CAI remains unclear.

Purpose of the Study:

To investigate differences in the spatial distribution of COP and TTB minima data points between individuals with and without CAI.
To determine if CAI affects the location of foot pressure and balance control points during static stance.

Main Methods:

A case-control study involving 50 healthy participants and 61 participants with CAI.
Participants performed quiet single-limb stance for 10 seconds on a force plate under eyes-open and eyes-closed conditions.
Analysis focused on the distribution of COP and TTB minima data points on the plantar surface of the foot.

Main Results:

During eyes-open stance, the CAI group showed more COP and TTB minima in the anterolateral foot region compared to controls.
In eyes-closed stance, the CAI group had significantly more COP and TTB minima anterior to the foot's horizontal midline.
Overall, the CAI group exhibited greater anterior displacement of COP and TTB minima during static single-limb stance.

Conclusions:

Individuals with CAI demonstrate altered postural control strategies during static single-limb stance.
These alterations involve a greater anterior shift in the distribution of COP and TTB minima.
This compensatory strategy may involve increased ankle dorsiflexion to enhance joint stability.